{"product_id":"oem-goodman-stack-overtemp-limit-switch-for-gun100-4-b1370109","title":"OEM Goodman Stack Overtemp Limit Switch for GUN100-4 — B1370109","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1370109 Stack Overtemp Switch\u003c\/strong\u003e is the OEM high-limit safety control that monitors flue\/vent temperature on the \u003cstrong\u003eGUN100-4\u003c\/strong\u003e gas furnace. Mounted near the stack (flue outlet), it opens the control circuit and shuts down the burners if vent temperatures climb past the safe threshold — a condition typically caused by a blocked flue, failing inducer draft, or a restricted heat exchanger.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e B1370109\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Stack \/ Flue Overtemp Limit Switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e High-temperature safety cutout on the vent stack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReset:\u003c\/strong\u003e Automatic (temperature-sensing bimetal)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits Model:\u003c\/strong\u003e Goodman GUN100-4 gas furnace\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Goodman \/ Amana\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003egenuine Goodman B1370109\u003c\/strong\u003e carries the correct trip temperature and body dimensions for the stack mounting location on this furnace. Generic high-limits with mismatched set points either nuisance-trip during normal firing or fail to protect against genuine overheat conditions. For a flue-temperature safety, match OEM exactly.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (2 \/ 5).\u003c\/strong\u003e Remove the mounting screws, disconnect the terminals, and install the replacement in the same orientation. If the switch has been tripping, have a technician diagnose the venting or draft problem first. Power off before servicing.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058188763507,"sku":"GOODMAN-13149","price":8.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-stack-overtemp-limit-switch-for-gun100-4-b1370109","provider":"National HVAC Parts","version":"1.0","type":"link"}